In Java(tm), null is not a keyword, but a special literal of the null type. It can be cast to any reference type, but not to any primitive type such as int or boolean. The null literal doesn't necessarily have value zero.
Add a jump rope to the motion and you will be skipping rope. The skipping moves won't bulk you up, but they can tone the muscles in your thighs, calves and butt -- your quadriceps, hamstrings, gluteals, iliopsoas, gastrocnemius and tibialis anterior.
ITâS A VERSATILE CARDIO TOOL. A random jump roping session might not do much to increase VO 2 Max. But within the context of a high-intensity interval routine â say, Tabata routine â jumping rope can be easily integrated to achieve great results.